package marioarena;

import java.security.MessageDigest;

public class Sha1 
{
	/**
	 * Hashes a string using the Sha-1 hashing method.
	 * @param text The text to hash.
	 * @return The hashed text.
	 */
    public static String Hash(String text)
    {
    	try
    	{
		    MessageDigest md = MessageDigest.getInstance("SHA-1");
		    byte[] sha1hash = new byte[40];
		    md.update(text.getBytes("iso-8859-1"), 0, text.length());
		    sha1hash = md.digest();
		    return convertToHex(sha1hash);
    	}
    	catch (Exception e)
    	{
    		return null;
    	}
    }
    
    private static String convertToHex(byte[] data) 
	{
        StringBuilder buf = new StringBuilder();
        for (int i = 0; i < data.length; i++) 
        {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do 
            {
                if ((0 <= halfbyte) && (halfbyte <= 9))
                    buf.append((char) ('0' + halfbyte));
                else
                	buf.append((char) ('a' + (halfbyte - 10)));
                halfbyte = data[i] & 0x0F;
            } while(two_halfs++ < 1);
        }
        return buf.toString();
    }
}
